/* bu_dehumanize_number is derived from NetBSD's implementation:
 * NetBSD: dehumanize_number.c,v 1.4 2012/03/13
 *
 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
 * 2005 program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE. */

/*
 * Converts the number given in 'str', which may be given in a humanized
 * form (as described in humanize_number(3), but with some limitations),
 * to an int64_t without units.
 * In case of success, 0 is returned and *size holds the value.
 * Otherwise, -1 is returned and *size is untouched.
 *
 * TODO: Internationalization, SI units.
 */

#include "common.h"

#ifdef HAVE_INTTYPES_H
#  if defined(__cplusplus)
#  define __STDC_FORMAT_MACROS
#  endif
#  include <inttypes.h>
#else
#  include "pinttypes.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <float.h>
#include <limits.h>
#include "vmath.h"

#include "bu/log.h"
#include "bu/malloc.h"
#include "bu/str.h"
#include "bu/units.h"
#include "bu/vls.h"

/* strict c89 doesn't declare strtoll() */
#ifndef HAVE_DECL_STRTOLL
extern long long int strtoll(const char *, char **, int);
#endif

#if !defined(LLONG_MAX) && defined(__LONG_LONG_MAX__)
#  define LLONG_MAX __LONG_LONG_MAX__
#endif
#if !defined(LLONG_MIN) && defined(__LONG_LONG_MAX__)
#  define LLONG_MIN (-__LONG_LONG_MAX__-1LL)
#endif

int
bu_dehumanize_number(const char *str, int64_t *size)
{
    char *ep, unit;
    const char *delimit;
    long multiplier;
    long long tmp, tmp2;
    size_t len;

    len = strlen(str);
    if (len == 0) {
	errno = EINVAL;
	return -1;
    }

    multiplier = 1;

    unit = str[len - 1];
    if (isalpha((unsigned char)unit)) {
	switch (tolower((unsigned char)unit)) {
	    case 'b':
		multiplier = 1;
		break;

	    case 'k':
		multiplier = 1024;
		break;

	    case 'm':
		multiplier = 1024 * 1024;
		break;

	    case 'g':
		multiplier = 1024 * 1024 * 1024;
		break;

	    default:
		errno = EINVAL;
		return -1; /* Invalid suffix. */
	}

	delimit = &str[len - 1];
    } else
	delimit = NULL;

    errno = 0;
    tmp = strtoll(str, &ep, 10);
    if (str[0] == '\0' || (ep != delimit && *ep != '\0'))
	return -1; /* Not a number. */
    else if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
	return -1; /* Out of range. */

    tmp2 = tmp * multiplier;
    tmp2 = tmp2 / multiplier;
    if (tmp != tmp2) {
	errno = ERANGE;
	return -1; /* Out of range. */
    }
    tmp *= multiplier;
    *size = (int64_t)tmp;

    return 0;
}


/*
 * Local Variables:
 * mode: C
 * tab-width: 8
 * indent-tabs-mode: t
 * c-file-style: "stroustrup"
 * End:
 * ex: shiftwidth=4 tabstop=8
 */
